linux-kernel - Re: [PATCH v12 11/29] KVM: SEV: Add KVM_SEV_SNP_LAUNCH

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Date: Sat, 30 Mar 2024 21:31:40 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc: linux-coco@...ts.linux.dev, linux-mm@...ck.org,
 linux-crypto@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
 tglx@...utronix.de, mingo@...hat.com, jroedel@...e.de,
 thomas.lendacky@....com, hpa@...or.com, ardb@...nel.org, seanjc@...gle.com,
 vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
 dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
 peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
 rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
 vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
 tony.luck@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
 alpergun@...gle.com, jarkko@...nel.org, ashish.kalra@....com,
 nikunj.dadhania@....com, pankaj.gupta@....com, liam.merwick@...cle.com,
 Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v12 11/29] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_UPDATE command

On 3/29/24 23:58, Michael Roth wrote:
> +	memslot = gfn_to_memslot(kvm, params.gfn_start);
> +	if (!kvm_slot_can_be_private(memslot)) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +

This can be moved to kvm_gmem_populate.

> +	populate_args.src = u64_to_user_ptr(params.uaddr);

This is not used if !do_memcpy, and in fact src is redundant with 
do_memcpy.  Overall the arguments can be "kvm, gfn, src, npages, 
post_populate, opaque" which are relatively few and do not need the struct.

I'll do that when posting the next version of the patches in kvm-coco-queue.

Paolo